Charging device and system

Abstract

The application relates to the technical field of charging, in particular to a charging device and system. The purpose is to improve the pre-charging efficiency and circuit integration. The charging device comprises: a plurality of buck-boost circuits, the plurality of buck-boost circuits are connected in parallel, and the rated working power of at least two buck-boost circuits is the same or different, and the buck-boost circuits are used for being coupled to a load; one or more charging ports are respectively coupled to the plurality of buck-boost circuits, and are used for outputting the voltage after the charging voltage input into the charging port is boosted or reduced by the buck-boost circuit; and a pre-charging circuit is connected in parallel with the plurality of buck-boost circuits. The above technical scheme improves the pre-charging and charging efficiency, improves the circuit integration, and reduces the electric control material and production cost.

Description

Technical Field

[0001] This application relates to the field of charging technology, and more particularly to a charging device and system. Background Technology

[0002] DC charging is a method in which a vehicle directly charges its battery using direct current. Specifically, the vehicle connects to a DC charging station via a vehicle interface, the charging station provides DC output to the vehicle through the vehicle interface, and the vehicle's battery management system (BMS) adjusts the charging voltage and current in real time.

[0003] In related technologies, the vehicle's power battery is charged through multiple charging piles. Each charging pile and the vehicle's power battery has a different pre-charging circuit. Before charging the power battery, the pre-charging circuit needs to be charged first to avoid excessive current surge caused by direct charging, which could damage the charging device.

[0004] However, when charging the battery through multiple charging stations, each pre-charging circuit corresponding to each charging station needs to be charged separately, which results in a long pre-charging time and a complex pre-charging process. Utility Model Content

[0005] The purpose of this application is to provide a charging device and system that aims to improve pre-charging efficiency and circuit integration.

[0006] In a first aspect, a charging device is provided, comprising multiple buck-boost circuits, one or more charging ports, and a pre-charging circuit. The multiple buck-boost circuits are connected in parallel, with at least two circuits having the same or different rated operating power, and are used for coupling to a load. One or more charging ports are respectively coupled to the multiple buck-boost circuits, used to boost or buck the charging voltage input to the charging port, and then output the boosted or bucked voltage from the buck-boost circuits. The pre-charging circuit is connected in parallel with the multiple buck-boost circuits.

[0007] The technical solution provided in this application connects multiple buck-boost circuits in parallel with the same pre-charging circuit. Before simultaneously charging using multiple charging ports or multiple buck-boost circuits, only a single pre-charging circuit needs to be charged, eliminating the need to charge multiple pre-charging circuits separately, thus improving pre-charging efficiency and consequently charging efficiency. Furthermore, using only a single pre-charging circuit increases the circuit integration of the charging device and reduces the cost of electronic control materials and production. In addition, the parallel connection of multiple buck-boost circuits ensures that charging can continue through the other circuits even if one fails, improving circuit stability.

[0008] In one embodiment, the buck-boost circuit includes a first coil and a first bridge arm. A first end of the first coil is coupled to a first end of a charging port. A first end and a second end of the first bridge arm are used to couple to a load. A second end of the first bridge arm is also coupled to a second end of the charging port. A third end of the first bridge arm is coupled to a second end of the first coil. When the lower half of the first bridge arm is turned on and the upper half is turned off, the first coil is charged through the charging port. When the upper half of the first bridge arm is turned on and the lower half is turned off, the load is charged through the charging port and the first coil.

[0009] In one embodiment, the buck-boost circuit further includes a second coil and a second bridge arm. A first end of the second coil is coupled to a first end of a charging port. The first and second ends of the second bridge arm are used to couple to a load. A second end of the second bridge arm is also coupled to a second end of the charging port. A third end of the second bridge arm is coupled to a second end of the second coil. When the lower half of the second bridge arm is on and the upper half is off, the second coil is charged through the charging port. When the upper half of the second bridge arm is on and the lower half is off, the load is charged through the charging port and the second coil.

[0010] In one embodiment, the pre-charging circuit includes a pre-charging capacitor connected in parallel with multiple buck-boost circuits. The pre-charging capacitor is configured to draw power from the load via the buck-boost circuits. Pre-charging via the pre-charging capacitor avoids voltage spikes at the start of charging, improving the safety of the high-voltage charging process.

[0011] In one embodiment, one or more charging ports are further configured to output charging power through a target buck-boost circuit among multiple buck-boost circuits, based on the charging power of the input charging port. The rated operating power of the target buck-boost circuit is greater than or equal to the charging power. This avoids situations where the rated operating power of the buck-boost circuit limits the charging power of the input charging port when the power of the input charging port is higher than the power of the buck-boost circuit (e.g., when the charging port is connected to a supercharging station), leading to prolonged charging time and wasted charging resources, thus further improving charging efficiency.

[0012] In one embodiment, a plurality of buck-boost circuits are included, comprising a first buck-boost circuit and a second buck-boost circuit, wherein the second buck-boost circuit and the first buck-boost circuit are connected in parallel, and the rated operating power of the first buck-boost circuit is less than or equal to the rated operating power of the second buck-boost circuit. The rated operating power of the first buck-boost circuit and the rated operating power of the second buck-boost circuit may be the same or different. The first buck-boost circuit and the second buck-boost circuit can be configured to provide various rated charging power values, thereby allowing for flexible selection of the first buck-boost circuit and / or the second buck-boost circuit for charging based on the charging power of the input charging port.

[0013] In one embodiment, when the charging power at the charging port is less than or equal to the rated operating power of the first buck-boost circuit, the first buck-boost circuit and / or the second buck-boost circuit are the target buck-boost circuits. When the charging power at the charging port is greater than the rated operating power of the first buck-boost circuit and less than or equal to the rated operating power of the second buck-boost circuit, the second buck-boost circuit, or either the first buck-boost circuit and the second buck-boost circuit, are the target buck-boost circuits. When the charging power at the charging port is greater than the rated operating power of the second buck-boost circuit, both the first buck-boost circuit and the second buck-boost circuit are the target buck-boost circuits.

[0014] In some embodiments, a plurality of charging ports include a first charging port and a second charging port. The first charging port is coupled to a first buck-boost circuit, and the second charging port is coupled to a second buck-boost circuit.

[0015] In one embodiment, one or more charging ports are further configured to: when the temperature of the buck-boost circuit is below a temperature threshold, boost or buck the charging voltage input to the charging port via the buck-boost circuit, and then output the boosted or bucked voltage via the buck-boost circuit. The buck-boost circuit operates below the temperature threshold, improving its operational safety and reliability.

[0016] In one embodiment, the charging device further includes: a plurality of switches, the first ends of which are coupled to a charging port, and the second ends of which are respectively coupled to a plurality of buck-boost circuits. By adjusting the on / off state of different switches, the buck-boost circuits can be selected and switched.

[0017] In a second aspect, a charging system is also provided, which includes one or more charging piles, a battery, and a charging device according to any embodiment of the first aspect. The one or more charging piles are respectively coupled to one or more charging ports of the charging device, and the battery is coupled to multiple buck-boost circuits of the charging device. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a charging system provided in an embodiment of this application;

[0020] Figure 2 This is a schematic diagram of the structure of a charging device provided in an embodiment of this application;

[0021] Figure 3 This is a schematic diagram of a step-up / step-down circuit provided in an embodiment of this application;

[0022] Figure 4 This is a schematic diagram of another buck-boost circuit provided in an embodiment of this application;

[0023] Figure 5 A schematic diagram of the flow direction of the pre-charging current provided in an embodiment of this application;

[0024] Figure 6 A schematic diagram illustrating the flow direction of another pre-charge current provided in an embodiment of this application;

[0025] Figure 7 A schematic diagram illustrating the flow direction of another pre-charge current provided in an embodiment of this application;

[0026] Figure 8 A schematic diagram illustrating the flow direction of another pre-charge current provided in an embodiment of this application;

[0027] Figure 9 A schematic diagram of the current flow direction during coil charging is provided in an embodiment of this application;

[0028] Figure 10 A schematic diagram of the current flow direction in a coil boost charging embodiment provided in this application;

[0029] Figure 11 A schematic diagram of the current flow direction for coil charging provided in an embodiment of this application;

[0030] Figure 12 A schematic diagram of the current flow direction for another coil boost charging method provided in this application embodiment;

[0031] Figure 13 A schematic diagram illustrating the current flow direction during coil charging, provided as an embodiment of this application;

[0032] Figure 14 A schematic diagram illustrating the current flow direction in another type of coil boost charging provided in this application embodiment;

[0033] Figure 15 A schematic diagram illustrating the current flow direction during coil charging, provided as an embodiment of this application;

[0034] Figure 16 A schematic diagram illustrating the current flow direction in another type of coil boost charging provided in this application embodiment;

[0035] Figure 17 A schematic diagram illustrating the current flow direction during coil charging, provided as an embodiment of this application;

[0036] Figure 18This is a schematic diagram of the current flow direction in another type of coil boost charging provided in an embodiment of this application.

[0037] Figure label:

[0038] 110. The first charging station;

[0039] K3, the third switch; K4, the fourth switch;

[0040] 120. Second charging station;

[0041] K5, the fifth switch; K6, the sixth switch;

[0042] 200. Charging device;

[0043] 210. First charging port;

[0044] K1, First Switch;

[0045] 220. Second charging port;

[0046] K2, the second switch;

[0047] 230 First buck-boost circuit;

[0048] L1, first coil; L2, second coil; L3, third coil;

[0049] 1. First bridge arm; 2. Second bridge arm; 3. Third bridge arm; a. Upper switch transistor; b. Lower switch transistor;

[0050] 240. Second buck-boost circuit;

[0051] L4, fourth coil; L5, fifth coil; L6, sixth coil;

[0052] 4. Fourth bridge arm; 5. Fifth bridge arm; 6. Sixth bridge arm;

[0053] 250. Pre-charging circuit;

[0054] Precharge capacitor C1

[0055] 300. Battery. Detailed Implementation

[0056] In the embodiments of this application, the terms "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," "third," "fourth," "fifth," and "sixth" may explicitly or implicitly include one or more of that feature.

[0057] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. "A and / or B" includes three combinations: A only, B only, and a combination of A and B.

[0058] In describing some embodiments, the terms "coupled" and "connected," and their derivative expressions, may be used. For example, the term "connected" may be used in describing some embodiments to indicate that two or more components have direct physical or electrical contact with each other. Similarly, the term "coupled" may be used in describing some embodiments to indicate that two or more components have direct physical or electrical contact. However, the terms "coupled" or "communicatively coupled" may also refer to two or more components that do not have direct contact with each other but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the content of this document.

[0059] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner. In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0060] This application provides a charging system.

[0061] The charging system charges equipment in fields such as vehicles, loading and unloading, and logistics.

[0062] Optionally, vehicles are also referred to as vehicles, mobile carriers, etc., including but not limited to sedans, sport utility vehicles (SUVs), trucks, electric vehicles, motorcycles, tricycles, driverless taxis, intelligent connected buses, autonomous logistics vehicles, electric trucks, electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), fuel cell vehicles (FCVs), autonomous vehicles, intelligent and connected vehicles (ICVs), driverless vehicles, special vehicles (such as ambulances, fire trucks, police cars, etc.), agricultural vehicles, mining vehicles, forestry vehicles, airport vehicles, etc., and this application does not impose specific restrictions on them.

[0063] For example, please refer to Figure 1 , Figure 1 This is a schematic diagram of a charging system provided in an embodiment of this application. Figure 1 As shown, the charging system provided in this application embodiment includes a first charging pile 110, a second charging pile 120, a charging device 200, and a battery 300. The first charging pile 110 is coupled to the first charging port 210 of the charging device 200, the second charging pile 120 is coupled to the second charging port 220 of the charging device 200, and the charging device 200 is coupled to the battery.

[0064] The charging device 200 draws power from the first charging pile 110 and the second charging pile 120 and outputs a suitable charging voltage to the battery 300.

[0065] For example, the charging device 200 includes a boost circuit, a buck circuit, a protection circuit, a filter circuit, and a control circuit.

[0066] In some embodiments, the charging device 200 includes parallel, independent charging circuits.

[0067] In related technologies, when a charging device charges a battery through different charging circuits corresponding to different charging piles, each charging circuit has a pre-charging circuit. Before charging at the charging pile, the pre-charging circuit needs to be pre-charged so that the voltage across the pre-charging circuit slowly rises to the output voltage of the charging pile, avoiding malfunctions caused by excessive current surges during direct charging. However, when multiple charging piles charge the battery, the pre-charging circuit needs to be charged separately, resulting in long pre-charging times and complex pre-charging processes.

[0068] Based on this, embodiments of this application provide a charging device that can reduce the pre-charging process, improve charging efficiency and circuit integration, and reduce costs.

[0069] For example, please refer to Figure 2 , Figure 2 This is a schematic diagram of a charging device provided in an embodiment of this application. The charging device includes a first buck-boost circuit 230, a second buck-boost circuit 240, a first charging port 210, and a pre-charging circuit 250. The first buck-boost circuit 230 and the second buck-boost circuit 240 are connected in parallel. The first and second terminals of the first buck-boost circuit 230 and the second buck-boost circuit 240 are used to couple to a battery 300. The first charging port 210 is coupled to the first buck-boost circuit 230. The pre-charging circuit 250 is connected in parallel with the first buck-boost circuit 230 and the second buck-boost circuit 240. The first charging port 210 is used to couple to a first charging pile.

[0070] The first charging port 210 is used to boost or buck the charging voltage input from the first charging pile into the first charging port 210, and then output the boosted or bucked voltage by the first buck-boost circuit 230 and / or the second buck-boost circuit 240.

[0071] In some embodiments, such as Figure 3 As shown, the first buck-boost circuit includes a first coil L1 and a first bridge arm 1. The first end of the first coil L1 is coupled to the first end of the first charging port 210. The first and second ends of the first bridge arm 1 are coupled to the battery 300. The second end of the first bridge arm 1 is also coupled to the second end of the first charging port 210, and the third end of the first bridge arm 1 is coupled to the second end of the first coil L1. When the lower half of the first bridge arm L1 is on and the upper half is off, the first coil L1 is charged through the first charging port 210. When the upper half of the first bridge arm 1 is on and the lower half is off, the battery 300 is charged through the first charging port 210 and the first coil L1.

[0072] The third end of the first bridge arm 1 is the common connection end of the upper and lower half of the first bridge arm 1.

[0073] For example, such as Figure 4As shown, the first buck-boost circuit also includes a second coil L2, a third coil L3, a second bridge arm 2, and a third bridge arm 3. The first coil L1, the second coil L2, and the third coil L3 are connected in parallel, and the first ends of the first coil L1, the second coil L2, and the third coil L3 are coupled to the first end of the first charging port 210. The first and second ends of the first bridge arm 1, the second bridge arm 2, and the third bridge arm 3 are used to couple to the battery 300. The common connection of the upper and lower half-bridges in the first bridge arm 1 is coupled to the second end of the first coil L1, the common connection of the upper and lower half-bridges in the second bridge arm 2 is coupled to the second end of the second coil L2, and the common connection of the upper and lower half-bridges in the third bridge arm 3 is coupled to the second end of the third coil L3.

[0074] The second buck-boost circuit 240 includes a fourth coil L4, a fifth coil L5, and a sixth coil L6, which are connected in parallel. The first ends of the fourth coil L4, the fifth coil L5, and the sixth coil L6 are coupled to the first end of the first charging port 210. It also includes a fourth bridge arm 4, a fifth bridge arm 5, and a sixth bridge arm 6. The first and second ends of the fourth bridge arm 4, the fifth bridge arm 5, and the sixth bridge arm 6 are used to couple to the battery 300. The common connection of the upper and lower half-bridges in the fourth bridge arm 4 is coupled to the second end of the fourth coil L4. The common connection of the upper and lower half-bridges in the fifth bridge arm 5 is coupled to the second end of the fifth coil L5. The common connection of the upper and lower half-bridges in the sixth bridge arm 6 is coupled to the second end of the sixth coil L6.

[0075] Among them, the first bridge arm 1, the second bridge arm 2, the third bridge arm 3, the fourth bridge arm 4, the fifth bridge arm 5 and the sixth bridge arm 6 each include an upper switch transistor a and a diode connected in parallel with the upper switch transistor a, as well as a lower switch transistor b and a diode connected in parallel with the lower switch transistor b. The common terminal of the upper switch transistor a and the lower switch transistor b is the common terminal of the upper half bridge and the lower half bridge.

[0076] For example, the conduction and disconnection states of the upper and lower half-bridges can be controlled by controlling the conduction and disconnection of the upper switch a and the lower switch b through pulse width modulation (PWM) signals. For instance, when the upper switch a of the first bridge arm 1 is on and the lower switch b is off, the upper half-bridge of the first bridge arm 1 is on and the lower half-bridge is off; when both the upper switch a and the lower switch b of the first bridge arm 1 are off, the diode connected in parallel with the lower switch b freewheels, and at this time the lower half-bridge of the first bridge arm 1 is on and the upper half-bridge is off.

[0077] Specifically, when the lower half of the first bridge arm 1, the second bridge arm 2, and the third bridge arm 3 are turned on and the upper half of the bridge is turned off, the first coil L1, the second coil L2, and the third coil L3 are charged through the first charging port 210; when the upper half of the first bridge arm 1, the second bridge arm 2, and the third bridge arm 3 are turned on and the lower half of the bridge is turned off, the battery 300 is charged through the first charging port 210, the first coil L1, the second coil L2, and the third coil L3. When the lower half of the fourth bridge arm 4, the fifth bridge arm 5, and the sixth bridge arm 6 are turned on and the upper half of the bridge is turned off, the fourth coil L4, the fifth coil L5, and the sixth coil L6 are charged through the first charging port 210; when the upper half of the fourth bridge arm 4, the fifth bridge arm 5, and the sixth bridge arm 6 are turned on and the lower half of the bridge is turned off, the battery 300 is charged through the first charging port 210, the fourth coil L4, the fifth coil L5, and the sixth coil L6, thus achieving boost charging of the battery 300.

[0078] In some embodiments, the coil is first charged through one or more charging ports, and then the battery is charged through the coil. The charging voltage of the coil current is less than the voltage input to the charging port, thus enabling step-down charging of the battery.

[0079] For example, the first coil is first charged by the voltage output to the first charging port through the first charging pile and the second charging pile. Then, the first charging pile and the second charging pile stop outputting voltage and short-circuit the first charging port to charge the battery through the first coil.

[0080] In some embodiments, the upper or lower half of the bridge arm in the charging device can be turned on to achieve the boost charging process of the battery through some coils. The more coils involved in the boost charging, the higher the boost level.

[0081] In some embodiments, the first coil L1, the second coil L2, the third coil L3, the fourth coil L4, the fifth coil L5, and the sixth coil L6 are coils in a motor, and the first bridge arm 1, the second bridge arm 2, the third bridge arm 3, the fourth bridge arm 4, the fifth bridge arm 5, and the sixth bridge arm 6 are circuits in a motor controller. The motor controller controls the on and off states of the bridge arms by adjusting the three-phase duty cycle.

[0082] In some embodiments, the pre-charge circuit 250 includes a pre-charge capacitor C1. The pre-charge capacitor C1 draws power from the battery 300 via a buck-boost circuit.

[0083] For example, the pre-charge capacitor C1 is pre-charged through the battery 300 and the first buck-boost circuit 230.

[0084] For example: Figure 5As shown, when the upper half of the first bridge arm 1 is on and the lower half is off, and when the upper and lower halves of the second bridge arm 2 and the third bridge arm 3 are off, the battery precharges the pre-charge capacitor C1 through a circuit consisting of the battery positive terminal, the upper half of the first bridge arm 1, the first coil L1, the pre-charge capacitor C1, and the battery negative terminal. At this time, the first switch K1 is on. Figure 6 As shown, the upper and lower half-bridges of the first bridge arm 1, the second bridge arm 2, and the third bridge arm 3 are disconnected. The first coil L1 is precharged by the circuit of the first end of the first coil L1, the pre-charge capacitor C1, the diode of the lower half-bridge of the first bridge arm 1, and the second end of the first coil L1. At this time, the first switch K1 is turned on.

[0085] For example, the pre-charge capacitor C1 is pre-charged by the battery 300 and the second buck-boost circuit 240.

[0086] For example: Figure 7 As shown, when the upper half of the fourth bridge arm 4 is conducting and the lower half is disconnected, and when the upper and lower half of the fifth bridge arm 5 and the sixth bridge arm 6 are disconnected, the battery precharges the pre-charge capacitor C1 through a circuit consisting of the battery positive terminal, the upper half of the fourth bridge arm 4, the fourth coil L4, the pre-charge capacitor C1, and the battery negative terminal. At this time, the second switch K2 is conducting. Figure 8 As shown, the upper and lower half-bridges of the fourth bridge arm 4, the fifth bridge arm 5, and the sixth bridge arm 6 are disconnected. The fourth coil L4 precharges the pre-charge capacitor C1 through the circuit of the first end of the fourth coil L4, the pre-charge capacitor C1, the diode of the lower half-bridge of the fourth bridge arm 4, and the second end of the fourth coil L4. At this time, the second switch K2 is turned on.

[0087] In some embodiments, one or more charging ports sample the voltage across the pre-charge capacitor. When the voltage across the pre-charge capacitor meets the charging conditions (e.g., the voltage across the pre-charge capacitor is greater than a voltage threshold), one or more charging ports output voltage to the buck-boost circuit.

[0088] In some embodiments, one or more charging ports are further configured to output charging power through a target buck-boost circuit in a plurality of buck-boost circuits based on the charging power of the input charging port.

[0089] The rated operating power of the target buck-boost circuit is greater than or equal to the charging power.

[0090] As an example, such as Figure 2 As shown, the multiple buck-boost circuits include a first buck-boost circuit 230 and a second buck-boost circuit 240. The first charging port 210 outputs the charging voltage of the first charging port 210 according to the charging power input to the first charging port 210. The voltage is then boosted or bucked by the target buck-boost circuit before being output.

[0091] The rated operating power of the first buck-boost circuit 230 is less than the rated operating power of the second buck-boost circuit 240.

[0092] For example, when the charging power of the first charging port 210 is less than or equal to the rated operating power of the first buck-boost circuit 230, the first buck-boost circuit 230 and / or the second buck-boost circuit 240 are the target buck-boost circuits.

[0093] For example, the first buck-boost circuit 230 is the target buck-boost circuit. For example... Figure 9 As shown, when the upper half of the first bridge arm 1, the second bridge arm 2, and the third bridge arm 3 is disconnected and the lower half of the bridge is connected, the first charging port 210 charges the first coil L1, the second coil L2, and the third coil L3 using the first end of the first charging port 210, the lower half of the first bridge arm 1, the second bridge arm 2, the third bridge arm 3, and the second end of the first charging port 210 as the charging circuit. At this time, the first switch K1, the third switch K3, and the fourth switch K4 are connected. Figure 10 As shown, when the lower half of the first bridge arm 1, the second bridge arm 2, and the third bridge arm 3 is disconnected and the upper half of the bridge is turned on, the first charging port 210 charges the battery 300 by using the first end of the first charging port 210, the first coil L1 / second coil L2 / third coil L3, the diodes of the upper half of the first bridge arm 1 / second bridge arm 2 / third bridge arm 3, the battery 300, and the second end of the first charging port 210 as the charging circuit. At this time, the first coil L1, the second coil L2, and the third coil L3 release energy to achieve voltage boost, and the first switch K1, the third switch K3, and the fourth switch K4 are turned on.

[0094] For example, when the charging power of the first charging port 210 is greater than the rated operating power of the first buck-boost circuit 230 and less than or equal to the rated operating power of the second buck-boost circuit 240, the second buck-boost circuit 240, or the first buck-boost circuit 230 and the second buck-boost circuit 240, is the target buck-boost circuit.

[0095] For example, the second buck-boost circuit 240 is the target buck-boost circuit. For example... Figure 11 As shown, when the upper half of the fourth bridge arm 4, the fifth bridge arm 5, and the sixth bridge arm 6 is disconnected and the lower half of the bridge is turned on, the first charging port 210 charges the fourth coil L4, the fifth coil L5, and the sixth coil L6 using the first end of the first charging port 210, the lower half of the fourth bridge arm 4, the fifth bridge arm 5, the sixth bridge arm 6, and the second end of the first charging port 210 as the charging circuit. At this time, the second switch K2, the third switch K3, and the fourth switch K4 are turned on.

[0096] like Figure 12As shown, when the lower half of the fourth bridge arm 4, the fifth bridge arm 5, and the sixth bridge arm 6 is disconnected and the upper half of the bridge is turned on, the first charging port 210 charges the battery 300 by using the first end of the first charging port 210, the diodes of the fourth coil L4 / fifth coil L5 / sixth coil L6, the upper half of the fourth bridge arm 4 / fifth bridge arm 5 / sixth bridge arm 6, the battery 300, and the second end of the first charging port 210 as the charging circuit. At this time, the fourth coil L4, the fifth coil L5, and the sixth coil L6 release energy to achieve voltage boost, and the second switch K2, the third switch K3, and the fourth switch K4 are turned on.

[0097] In some embodiments, when the charging power of one or more charging ports is greater than the rated operating power corresponding to the target buck-boost circuit, the battery is charged through all buck-boost circuits, thereby minimizing the limitation of the rated power of the buck-boost circuit on the charging power.

[0098] For example, when the charging power of the first charging port 210 is greater than the rated operating power of the first buck-boost circuit 230 and the second buck-boost circuit 240, the battery is charged through the first buck-boost circuit 230 and the second buck-boost circuit 240. The current flows to the first buck-boost circuit 230 and the second buck-boost circuit 240 respectively, based on the ratio of the rated power between the first buck-boost circuit 230 and the second buck-boost circuit 240.

[0099] For example, such as Figure 13 As shown, when the upper half of the first bridge arm 1, second bridge arm 2, third bridge arm 3, fourth bridge arm 4, fifth bridge arm 5, and sixth bridge arm 6 is disconnected and the lower half of the bridge is connected, the first charging port 210 charges the first coil L1, second coil L2, and third coil L3 using the first end of the first charging port 210, the lower half of the first bridge arm 1, second bridge arm 2, and third bridge arm 3, and the second end of the first charging port 210 as the charging circuit. The first charging port 210 also charges the fourth coil L4, fifth coil L5, and sixth coil L6 using the first end of the first charging port 210, the lower half of the fourth bridge arm 4, fifth bridge arm 5, and sixth bridge arm 6, and the second end of the first charging port 210 as the charging circuit. At this time, the first switch K1, second switch K2, third switch K3, and fourth switch K4 are connected.

[0100] like Figure 14As shown, when the lower half of the first bridge arm 1, second bridge arm 2, third bridge arm 3, fourth bridge arm 4, fifth bridge arm 5, and sixth bridge arm 6 is disconnected and the upper half of the bridge is turned on, the first charging port 210 charges the battery 300 using the first end of the first charging port 210, the first coil L1 / second coil L2 / third coil L3, the diodes of the upper half of the first bridge arm 1 / second bridge arm 2 / third bridge arm 3, the battery 300, and the second end of the first charging port 210 as the charging circuit. At the same time, the first charging port 210 uses the first charging... The first end of port 210, the diodes of the fourth coil L4 / fifth coil L5 / sixth coil L6, the upper half of the fourth bridge arm 4 / fifth bridge arm 5 / sixth bridge arm 6, the battery 300, and the second end of the first charging port 210 form a charging circuit to charge the battery 300. At this time, the first coil L1, the second coil L2, the third coil L3, the fourth coil L4, the fifth coil L5, and the sixth coil L6 release energy to achieve voltage boost, and the first switch K1, the second switch K2, the third switch K3, and the fourth switch K4 are turned on.

[0101] As an example, the first charging port 210 and the second charging port 220 will output the charging voltage of the first charging port 210, which will be boosted or bucked by the first buck-boost circuit 230 and / or the second buck-boost circuit 240 before being output.

[0102] For example, when the sum of the charging power of the first charging port 210 and the charging power of the second charging port 220 is less than or equal to the rated operating power of the first buck-boost circuit 230, the first buck-boost circuit 230 and / or the second buck-boost circuit 240 are the target buck-boost circuits.

[0103] For example, when the sum of the charging power of the first charging port 210 and the charging power of the second charging port 220 is greater than the rated operating power of the first buck-boost circuit 230 and less than or equal to the rated operating power of the second buck-boost circuit 240, the second buck-boost circuit 240, or the first buck-boost circuit 230 and the second buck-boost circuit 240, is the target buck-boost circuit.

[0104] For example: the second buck-boost circuit 240 is the target buck-boost circuit. For example... Figure 15 As shown, when the upper half of the fourth bridge arm 4, the fifth bridge arm 5, and the sixth bridge arm 6 is disconnected and the lower half of the bridge is connected, the first charging port 210 and the second charging port 220 charge the fourth coil L4, the fifth coil L5, and the sixth coil L6 using the first end of the first charging port 210, the lower half of the fourth bridge arm 4, the fifth bridge arm 5, the sixth bridge arm 6, and the second end of the first charging port 210 as the charging circuit. At this time, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5, and the sixth switch K6 are connected. Figure 16As shown, when the lower half of the fourth bridge arm 4, the fifth bridge arm 5, and the sixth bridge arm 6 is disconnected and the upper half of the bridge is turned on, the first charging port 210 and the second charging port 220 charge the battery 300 by using the first end of the first charging port 210, the diodes of the fourth coil L4 / fifth coil L5 / sixth coil L6, the upper half of the fourth bridge arm 4 / fifth bridge arm 5 / sixth bridge arm 6, the battery 300, and the second end of the first charging port 210 as the charging circuit. At this time, the fourth coil L4, the fifth coil L5, and the sixth coil L6 release energy to achieve voltage boost, and the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5, and the sixth switch K6 are turned on.

[0105] For example, when the sum of the charging power of the first charging port 210 and the charging power of the second charging port 220 is greater than the rated operating power of the second buck-boost circuit 240, the battery is charged through the first buck-boost circuit 230 and the second buck-boost circuit 240. The current flows to the first buck-boost circuit 230 and the second buck-boost circuit 240 respectively, based on the ratio of the rated power between the first buck-boost circuit 230 and the second buck-boost circuit 240.

[0106] For example: Figure 17 As shown, when the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5, and the sixth switch K6 are turned on, the upper half of the first bridge arm 1, the second bridge arm 2, the third bridge arm 3, the fourth bridge arm 4, the fifth bridge arm 5, and the sixth bridge arm 6 are turned off, and the lower half of the bridge is turned on, the first charging port 210 and the second charging port 220 charge the first coil L1, the second coil L2, and the third coil L3 using the first end of the first charging port 210, the lower half of the first bridge arm 1, the second bridge arm 2, the third bridge arm 3, and the second end of the first charging port 210 as the charging circuit. The first charging port 210 and the second charging port 220 also form a charging circuit to charge the fourth coil L4, the fifth coil L5 and the sixth coil L6, the lower half of the fourth bridge arm 4, the fifth bridge arm 5 and the sixth bridge arm 6, and the second end of the first charging port 210.

[0107] like Figure 18As shown, when the first switch K1, second switch K2, third switch K3, fourth switch K4, fifth switch K5, and sixth switch K6 are turned on, the lower half of the bridge consisting of the first bridge arm 1, second bridge arm 2, third bridge arm 3, fourth bridge arm 4, fifth bridge arm 5, and sixth bridge arm 6 is turned off, and the upper half of the bridge is turned on, the first charging port 210 and the second charging port 220 are connected to the diodes of the upper half of the first bridge arm 1, second bridge arm 2, and third bridge arm 3, the first terminal of the first charging port 210, the first coil L1 / second coil L2 / third coil L3, the first bridge arm 1 / second bridge arm 2 / third bridge arm 3, the battery 300, and the first charging port. The second end of 210 is a charging circuit to charge the battery 300. At the same time, the first charging port 210 and the second charging port 220 use the first end of the first charging port 210, the diodes of the fourth coil L4 / fifth coil L5 / sixth coil L6, the fourth bridge arm 4 / fifth bridge arm 5 / sixth bridge arm 6, the battery 300, and the second end of the first charging port 210 as a charging circuit to charge the battery 300. At this time, the first coil L1, the second coil L2, the third coil L3, the fourth coil L4, the fifth coil L5, and the sixth coil L6 release energy to achieve voltage boost.

[0108] In some embodiments, when switching the target buck-boost circuit, the switch corresponding to the target buck-boost circuit should be closed first, and then the switches of other buck-boost circuits should be turned off to ensure the continuous stability of the charging process. For example, when switching from the first buck-boost circuit to the second buck-boost circuit, the second switch K2 should be turned on first, and then the first switch K1 should be turned off.

[0109] In some embodiments, one or more charging ports are further configured to, when the temperature of the buck-boost circuit is less than a temperature threshold, boost or buck the charging voltage input to the charging port through the buck-boost circuit and output the boosted or bucked voltage through the buck-boost circuit.

[0110] For example, the rated power of the first buck-boost circuit is the maximum charging power that can be achieved when the operating power of the first coil is less than its maximum power, the operating power of the first bridge arm is less than its maximum power, the temperature of the first coil is less than its maximum operating temperature, and the temperature of the first bridge arm is less than its maximum operating temperature.

[0111] In the description of the embodiments of this application, specific features, structures, materials or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0112] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A charging device, characterized in that, include: Multiple buck-boost circuits, wherein the multiple buck-boost circuits are connected in parallel and at least two buck-boost circuits have the same or different rated operating power, for coupling to a load; One or more charging ports are respectively coupled to multiple buck-boost circuits, used to boost or buck the charging voltage input to the charging port, and output the boosted or bucked voltage by the buck-boost circuits; The pre-charging circuit is connected in parallel with multiple of the aforementioned buck-boost circuits.

2. The charging device according to claim 1, characterized in that, The buck-boost circuit includes: A first coil, the first end of which is coupled to the first end of the charging port; The first bridge arm has a first end and a second end for coupling to the load, and the second end of the first bridge arm is also coupled to the second end of the charging port; the third end of the first bridge arm is coupled to the second end of the first coil. When the lower half of the first bridge arm is turned on and the upper half is turned off, the first coil is charged through the charging port; when the upper half of the first bridge arm is turned on and the lower half is turned off, the load is charged through the charging port and the first coil.

3. The charging device according to claim 2, characterized in that, The step-up / step-down circuit also includes: The second coil, the first end of the second coil being coupled to the first end of the charging port; The second bridge arm has a first end and a second end for coupling to the load, and a second end for coupling to the second end of the charging port; the third end of the second bridge arm is coupled to the second end of the second coil.

4. The charging device according to claim 1, characterized in that, The pre-charging circuit includes: A pre-charge capacitor, wherein the pre-charge capacitor is connected in parallel with a plurality of the buck-boost circuits; The precharge capacitor is configured to draw power from the load via the buck-boost circuit.

5. The charging device according to claim 1, characterized in that, One or more of the charging ports are further configured to output the charging power through a target buck-boost circuit among the multiple buck-boost circuits based on the charging power input to the charging port, wherein the rated operating power of the target buck-boost circuit is greater than or equal to the charging power.

6. The charging device according to claim 5, characterized in that, The plurality of buck-boost circuits include: First step-up / step-down circuit; A second buck-boost circuit is connected in parallel with the first buck-boost circuit, and the rated operating power of the first buck-boost circuit is less than or equal to the rated operating power of the second buck-boost circuit.

7. The charging device according to claim 6, characterized in that, When the charging power at the charging port is less than or equal to the rated operating power of the first buck-boost circuit, the first buck-boost circuit and / or the second buck-boost circuit are the target buck-boost circuits; when the charging power at the charging port is greater than the rated operating power of the first buck-boost circuit and less than or equal to the rated operating power of the second buck-boost circuit, the second buck-boost circuit, or the first buck-boost circuit and the second buck-boost circuit are the target buck-boost circuits; when the charging power at the charging port is greater than the rated operating power of the second buck-boost circuit, the first buck-boost circuit and the second buck-boost circuit are the target buck-boost circuits.

8. The charging device according to claim 6, characterized in that, The plurality of charging ports include: The first charging port is coupled to the first buck-boost circuit. The second charging port is coupled to the second buck-boost circuit.

9. The charging device according to claim 1, characterized in that, One or more of the charging ports are further configured to: when the temperature of the buck-boost circuit is less than a temperature threshold, boost or buck the charging voltage input to the charging port through the buck-boost circuit, and then output the boosted or bucked voltage through the buck-boost circuit.

10. The charging device according to claim 1, characterized in that, The charging device further includes: Multiple switches, with the first end of each switch coupled to the charging port and the second end of each switch respectively coupled to the multiple buck-boost circuits.

11. A charging system, characterized in that, The charging system includes one or more charging piles, a battery, and a charging device as described in claim 1. The one or more charging piles are respectively coupled to one or more charging ports of the charging device, and the battery is coupled to multiple buck-boost circuits of the charging device.

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